/
operations.go
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/
operations.go
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// Copyright 2016 IBM Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package protocol
import (
"github.com/ant0ine/go-json-rest/rest"
"github.com/amalgam8/amalgam8/registry/server/env"
)
// Operation represents an operation exposed by the Service Discovery API.
type Operation string
// The following are the current API operations exposed by Service Discovery.
//
// While most operations have implementations in both API protocols (Amalgam8 / Eureka),
// some are unique to a certain protocol - e.g., SetInstanceStatus is currently unique to Eureka).
//
// Also, several sub-operations may be mapped to the same Operation value, e.g. Amalgam8's ListInstances
// as well as Eureka's ListVips are both mapped to ListInstances.
const (
RegisterInstance Operation = "Register"
DeregisterInstance = "Deregister"
RenewInstance = "Renew"
ListServices = "ListServices"
ListServiceInstances = "ListServiceInstances"
ListInstances = "ListInstances"
SetInstanceStatus = "SetStatus"
GetInstance = "GetInfo"
)
// String returns a string representation of this Operation value.
func (op Operation) String() string {
return string(op)
}
// APIHandler returns a wrapper HandlerFunc that injects API information into the HTTP request's context (r.Env),
// before calling the provided HandlerFunc.
// The given protocol is injected as the env.APIProtocol, and the given operation as the env.APIOperation.
func APIHandler(handler rest.HandlerFunc, protocol Type, operation Operation) rest.HandlerFunc {
return func(w rest.ResponseWriter, r *rest.Request) {
r.Env[env.APIProtocol] = protocol
r.Env[env.APIOperation] = operation
handler(w, r)
}
}